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LOW-TEMPERATURE CO-FIRED MICROWAVE DIELECTRIC CERAMIC MATERIAL AND PREPARATION METHOD THEREOF
A low-temperature, high stability co-fired microwave dielectric composite of ceramic and glass, including 85-99 wt % microwave dielectric ceramic of formula [1-y-z[(1−x)Mg2SiO4−xCa2SiO4]−yCaTiO3−zCaZrO3, wherein 0.2≦x≦0.7,0.05≦y≦0.3 and 0.02≦z≦0.15], and 1 to 15 wt % with Li2O—BaO—SrO—CaO—B2O3—SiO2 glass respectively made at a low sintering temperature of ceramic for co-firing with Ag or Cu electrode, employing eutectic phase of ceramic oxides to reduce its melting temperature, a low melting-point glass material with high chemical stability as a sintering aid added to oxides and raw material powders of Li2O, BaO, SrO, CaO, B2O3 and SiO2, obtained by combining and melting the ingredients in the temperature range between 1000 to 1300° C., quenching and crashing, and then adding it to the main ceramic oxides to form the final composition. This ceramic/glass composite material may be co-fired with an Ag and Cu electrode at 900° C.-970° C. for 0.5-4 hours in a protective atmosphere. After sintering, this dielectric material possesses efficacious microwave dielectric properties, dielectric constant between middle-K to low-K at 8−15, high quality factors, low dielectric loss, low temperature-capacitance coefficient and superior chemical stability suitable for manufacture of multilayer ceramic devices.
LOW-TEMPERATURE CO-FIRED MICROWAVE DIELECTRIC CERAMIC MATERIAL AND PREPARATION METHOD THEREOF
A low-temperature, high stability co-fired microwave dielectric composite of ceramic and glass, including 85-99 wt % microwave dielectric ceramic of formula [1-y-z[(1−x)Mg2SiO4−xCa2SiO4]−yCaTiO3−zCaZrO3, wherein 0.2≦x≦0.7,0.05≦y≦0.3 and 0.02≦z≦0.15], and 1 to 15 wt % with Li2O—BaO—SrO—CaO—B2O3—SiO2 glass respectively made at a low sintering temperature of ceramic for co-firing with Ag or Cu electrode, employing eutectic phase of ceramic oxides to reduce its melting temperature, a low melting-point glass material with high chemical stability as a sintering aid added to oxides and raw material powders of Li2O, BaO, SrO, CaO, B2O3 and SiO2, obtained by combining and melting the ingredients in the temperature range between 1000 to 1300° C., quenching and crashing, and then adding it to the main ceramic oxides to form the final composition. This ceramic/glass composite material may be co-fired with an Ag and Cu electrode at 900° C.-970° C. for 0.5-4 hours in a protective atmosphere. After sintering, this dielectric material possesses efficacious microwave dielectric properties, dielectric constant between middle-K to low-K at 8−15, high quality factors, low dielectric loss, low temperature-capacitance coefficient and superior chemical stability suitable for manufacture of multilayer ceramic devices.
LOW-TEMPERATURE CO-FIRED MICROWAVE DIELECTRIC CERAMIC MATERIAL AND PREPARATION METHOD THEREOF
CHU LI-WEN (author) / FENG KUEI-CHIH (author) / LIANG CHIH-HAO (author)
2017-11-23
Patent
Electronic Resource
English
IPC:
C04B
Kalk
,
LIME
Low-temperature co-fired microwave ceramic dielectric material and preparation method thereof
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